The incident occurred at 10:45 p.m. In addition, there was evidence of prior vandalism at the campaign office where paint had been scraped off the building, police said.

"We are taking this very seriously," Cronin said.

Police also plan to increase their security and patrol the area as often as possible.

Police said a man was seen running eastbound toward High Street after the vandalism.

Campaign workers in the office said they thought they heard gunshots but realized that it was noise from breaking glass.

"This is not acceptable and I will not be silenced by cowardly acts," Juarez said.

Juarez campaign manager Kathy Neal said the incident is the latest in a string of intimidation attacks against the campaign. She said some campaign supporters have received anonymous, threatening letters and several merchants have been intimidated and told to remove campaign signage from their store windows. In addition, Juarez said, his tires were slashed.

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Juarez said the cost of the damage is estimated at $10,000. Juarez has hired a private security company to protect his campaign office.